Physics, Techniques and Procedures

X-ray image

an image formed by recording the distribution of X-ray radiation after the radiation has passed through an object of interest. As opposed to other types of images which are formed by light which is reflected from the surface of an object, an X-ray image is formed by the radiation that is able to pass through an object. Parts of the object that are more dense will absorb a greater fraction of the X-ray beam, and will appear "dark" in terms of amount of X-ray flux detected. Similarly, parts of the object that are less dense will appear "bright" in terms of amount of X-ray flux. X ray film typically creates an image of the negative of the X-ray flux, with regions that are highly exposed with X-rays appearing dark and lightly exposed regions (e.g. bones) appearing bright.

DLP